Forest Ecosystems最新文献

{"title":"Species-specific influences of competition and tree size on drought sensitivity and resistance for three planted conifers in northern China","authors":"Rui Deng, Jinglei Liao, Tim Rademacher, Zhongqi Xu, Mingchao Du, Jianwei Zheng, Lihua Fu, Xianliang Zhang","doi":"10.1016/j.fecs.2025.100295","DOIUrl":"https://doi.org/10.1016/j.fecs.2025.100295","url":null,"abstract":"Droughts have caused tree growth decline and high tree mortality across temperate forests, however, how to manage planted forests to alleviate drought stress is still challenging. We used tree-ring and forest inventory data from different density stands to investigate how competition, tree diameter at breast height (DBH), tree age, and their interactions influence drought sensitivity and resistance for three widely-distributed and planted conifer species (<ce:italic>Larix principis-rupprechtii</ce:italic>, <ce:italic>Picea meyeri</ce:italic>, and <ce:italic>Pinus sylvestris</ce:italic> var. <ce:italic>mongolica</ce:italic>). Our results showed that the drought sensitivity of the three species was influenced by competition, tree size, and their interactions. Large <ce:italic>L.</ce:italic><ce:italic>principis-rupprechtii</ce:italic> trees were particularly sensitive to drought during the growing season in medium to high-density stands, while the growth of large <ce:italic>P. sylvestris</ce:italic> var. <ce:italic>mongolica</ce:italic> was most affected by precipitation at low to medium density stands. Drought resistance of <ce:italic>L. principis-rupprechtii</ce:italic> trees decreased as tree size increased. Large <ce:italic>L.</ce:italic><ce:italic>principis-rupprechtii</ce:italic> trees had lower drought resistance than small trees in all stands. Drought resistance of large <ce:italic>P. meyeri</ce:italic> trees exhibited high resistance to drought only in high-density stands. However, drought resistance of <ce:italic>P. sylvestris</ce:italic> var. <ce:italic>mongolica</ce:italic> trees was affected by tree size, competition, and their interactions. These results indicated that targeted silvicultural interventions, such as thinning, can be implemented to enhance drought resistance specifically for large <ce:italic>L. principis-rupprechtii</ce:italic> trees and small <ce:italic>P. sylvestris</ce:italic> var. <ce:italic>mongolica</ce:italic> trees in medium and high competition stands, and small <ce:italic>P. meyeri</ce:italic> trees in high competition stands. Our results highlight that properly conducted thinning can in some cases enhance growth resistance to droughts, depending on stand density, tree size, and tree species.","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"48 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variable growth responses of four tree species to climate and drought in a Madrean pine-oak forest","authors":"Marín Pompa-García, J. Julio Camarero, Cristina Valeriano, Eduardo Daniel Vivar-Vivar","doi":"10.1016/j.fecs.2025.100292","DOIUrl":"https://doi.org/10.1016/j.fecs.2025.100292","url":null,"abstract":"The tolerance of tree growth to drought in diverse mixed forests subjected to seasonal water shortage is understudied despite their ecological and economic relevance. By combining intra- and inter-annual analyses of radial growth responses to climate and drought at daily and monthly scales, different strategies to acclimate to hydroclimate variability of coexisting conifers and broadleaves were unveiled. We analyzed the growth patterns and responses to hydroclimate variability in two conifers (<ce:italic>Pinus engelmannii</ce:italic>, <ce:italic>Juniperus deppeana</ce:italic>) and two broadleaves (<ce:italic>Quercus grisea</ce:italic>, <ce:italic>Arbutus arizonica</ce:italic>) co-occurring in a Madrean pine-oak forest located in NW México. The strongest positive response to daily precipitation was found in the two conifers, but this response peaked earlier in <ce:italic>J. deppeana</ce:italic> than in <ce:italic>P. engelmannii</ce:italic>, which presented a more delayed formation of radially-enlarging tracheids. The latest negative response to temperature was found in <ce:italic>Q. grisea</ce:italic>, which agrees with its more delayed xylogenesis than <ce:italic>A. arizonica</ce:italic>. <ce:italic>P. engelmannii</ce:italic> presented the highest responsiveness to water shortage, driven by lower precipitation and high maximum temperatures, responding to longer droughts ending in autumn (<ce:italic>r</ce:italic> ​= ​0.72), whilst <ce:italic>A. arizonica</ce:italic> showed the lowest responsiveness to short spring droughts (<ce:italic>r</ce:italic> ​= ​0.39). Growth of <ce:italic>P. engelmannii</ce:italic> was linked to climate-atmospheric circulation patterns over the near Pacific Ocean. Overall, <ce:italic>P. engelmannii</ce:italic> and <ce:italic>A. arizonica</ce:italic> showed high growth rates and earlier growth onset, whilst <ce:italic>J. deppeana</ce:italic> and <ce:italic>Q. grisea</ce:italic> showed slower growth rates and later growth onset. The Vaganov-Shashkin growth model evidenced that winter-spring soil moisture was the key driver of growth. Under more arid conditions and more frequent and hotter droughts, pine stands could rapidly shift towards mixed pine-oak forests.","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"9 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142967826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The patterns of forest soil particulate and mineral associated organic carbon characteristics with latitude and soil depth across eastern China","authors":"Yunlong Hu, Gukailin Ao, Jiguang Feng, Xiao Chen, Biao Zhu","doi":"10.1016/j.fecs.2024.100291","DOIUrl":"https://doi.org/10.1016/j.fecs.2024.100291","url":null,"abstract":"Forest ecosystems function as the largest carbon (C) sink in terrestrial ecosystems, and nearly half of the C in forest ecosystems is stored in forest soils. However, the patterns of two main fractions of soil organic C, particulate organic C (POC) and mineral-associated organic C (MAOC), across various types of forest ecosystems remain unclear. In this study, soil samples were collected from depths of 0–100 ​cm at eight sites located between 18° and 48° north latitude in eastern China. The soil samples were then separated into particulate organic matter (POM) and mineral-associated organic matter (MAOM) based on particle size to analyze the distribution of C within each fraction. The results showed that the C stored as POC increased with latitude and decreased with soil depth. Specifically, 28.1%, 38.5% and 55.6% of C was stored as POC in the topsoil (0–30 ​cm) of tropical, subtropical and temperate forests, respectively, while 24.0%, 24.3% and 38.9% of C was stored as POC in the subsoil (30–100 ​cm) of the corresponding forests, respectively. MAOC experienced a higher degree of microbial processing (indicated by differences in δ<ce:sup loc=\"post\">13</ce:sup>C, δ<ce:sup loc=\"post\">15</ce:sup>N and C:N between POM and MAOM) than POC, with a more pronounced difference in microbial processing between MAOC and POC at lower latitudes than at higher latitudes. These findings contribute to a comprehensive understanding of the characteristics of forest SOC and offer potential strategies for enhancing forest C sequestration.","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ungulate browsing patterns and forage abundance determine the regeneration of palatable tree species: Using new perspectives in assessing ungulate browsing pressure in temperate forests","authors":"Aklilu Bajigo Madalcho, Anna Gazda, Jerzy Szwagrzyk","doi":"10.1016/j.fecs.2024.100288","DOIUrl":"https://doi.org/10.1016/j.fecs.2024.100288","url":null,"abstract":"Herbivorous ungulates are vital elements of forest ecosystems, yet their impact on tree regeneration and forest dynamics is challenging to assess. Despite their significant influence, few studies measure browsing pressure independently of precise ungulate population data. This study aimed to determine the regeneration mechanisms of palatable tree species in natural forest ecosystems by measuring the forage abundance from young trees of focal species and estimating the browsing pressure exerted by ungulates. We analyzed an extensive dataset of 2,838 tree saplings in two national parks in Poland to examine relationships between variables using a zero-intercept linear regression, and multiple linear regression models, and performed parametric and nonparametric tests. We found that the browsing intensity index (BI) is a good predictor of browsing pressure. Both total abundance and twig dry mass loss due to ungulate browsing were more pronounced in shorter saplings, with these effects decreasing as sapling height increased. <ce:italic>Picea abies</ce:italic> was the most abundant browse source in the Tatra National Park (TNP), whereas <ce:italic>Fagus sylvatica</ce:italic> dominated in the Roztocze National Park (RNP). <ce:italic>Acer pseudoplatanus</ce:italic> and <ce:italic>Sorbus aucuparia</ce:italic> experienced significantly higher browsing pressure in the TNP, whereas <ce:italic>Carpinus betulus</ce:italic> was more heavily browsed than other species in the RNP. The increase in browse abundance rapidly reduced ungulate browsing pressure on highly palatable tree species. We conclude that despite the high browsing pressure on the palatable species, the contribution of browse from focal species helps to mitigate this pressure and supports their regeneration in the forest canopy. Therefore, this finding provides valuable insights for managing and conserving tree species vulnerable to ungulate browsing in natural forest ecosystems. In addition, the method we used in this study is novel to estimate browsing pressure and assess the recruitment potential of vulnerable tree species; hence, it can be applied in large-scale studies with similar scenarios.","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"16 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Climatic habitat regulates the radial growth sensitivity of two conifers in response to climate change","authors":"Ruhong Xue, Liang Jiao, Peng Zhang, Xuge Wang, Qian Li, Xin Yuan, Zhengdong Guo, Le Zhang, Yarong Qin","doi":"10.1016/j.fecs.2024.100282","DOIUrl":"https://doi.org/10.1016/j.fecs.2024.100282","url":null,"abstract":"The survival and mortality of conifer trees in response to climate change, particularly drought stress, have received considerable attention. However, it is crucial to explore the growth dynamics of the same conifer species in response to climate change in different climatic habitats. In this study, we aimed to quantify variations in the radial growth processes of conifer species, analyze their resilience during drought periods under different climatic habitats, and assess the impact of climate adaptation on conifer growth. We focused on two conifer species, <ce:italic>Picea crassifolia</ce:italic> (spruce) and <ce:italic>Pinus tabuliformis</ce:italic> (pine), which are distributed in both a humid habitat and a dry habitat in the northeastern Tibetan Plateau. Growth and resilience dynamics were identified across both climatic habitats and the contributions of temperature and moisture to the growth of the two species were simulated under drought stress using the VS-oscilloscope model. Spruce growth exhibited significant variability between climatic habitats. Specifically, the spruce growth rate declined in response to drought in the dry habitat (−0.91 ​cm<ce:sup loc=\"post\">2</ce:sup> per decade, <ce:italic>p</ce:italic> ​&lt; ​0.01). In contrast, pine growth remained relatively stable (humid habitat: −0.03 ​cm<ce:sup loc=\"post\">2</ce:sup> per decade; dry habitat: 0.25 ​cm<ce:sup loc=\"post\">2</ce:sup> per decade, <ce:italic>p</ce:italic> ​&gt; ​0.01), although it still responded to stress during the growing season (<ce:italic>p</ce:italic> ​&lt; ​0.05). Furthermore, spruce displayed reduced resistance during stress in dry habitats (−30.11%), while pine exhibited an enhanced recovery of growth rates to ensure survival (+39.62%). The climate adaptation strategies of the species were linked to the contribution of temperature and moisture to their growth rates. Moisture is critical for the growth recovery of both conifers in dry habitats when temperature-associated growth displays a ‘bimodal’ pattern during the growing season. These findings have significant ecological implications for understanding conifer forest processes in the context of global climate change.","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"60 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationships between charcoal property and post fire productivity in the boreal forest","authors":"Lei Gao ,&nbsp;David Paré ,&nbsp;Flavia Lega Braghiroli ,&nbsp;Mathieu Lamarche ,&nbsp;Yves Bergeron","doi":"10.1016/j.fecs.2024.100277","DOIUrl":"10.1016/j.fecs.2024.100277","url":null,"abstract":"<div><div>Fire disturbances are increasing under global climate change and ecological transformations of forests are occurring. Specifically, shifts from productive closed-canopy feather moss forests to low-productivity open-canopy lichen (<em>Cladonia</em> spp.) woodlands have been observed in boreal forests of eastern Canada. It has been hypothesized that high severity of fires would be the cause of this change, but this is difficult to validate <em>a posteriori</em> on mature forest stands. Because charcoal properties are affected by fire severity, we have put forward the hypothesis that the amount and physicochemical properties of charcoal (C, N, H, O, ash, surface area) would be different and indicative of a greater fire severity for open-canopy forests compared to closed canopy ones. Our hypothesis was partly validated in that the amount of charcoal found on the ground of closed-canopy forests was greater than that of open-canopy forests. However, the physicochemical properties were not different, albeit a greater variability of charcoal properties for open canopy stands. These results do not allow us to fully validate or reject our hypothesis on the role of fire severity in the shift between open and closed canopy stands. However, they suggest that the variability in fire conditions as well as the amounts of charcoal produced are different between the two ecosystem types. Furthermore, considering the role that biochar may play in improving soil conditions and promoting vegetation restoration, our results suggest that charcoal may play a role in maintaining these two stable alternative ecosystem states.</div></div>","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"12 ","pages":"Article 100277"},"PeriodicalIF":3.8,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating tree branch angle measurements of European beech using terrestrial laser scanning","authors":"Xi Peng,&nbsp;Kim Calders,&nbsp;Louise Terryn,&nbsp;Hans Verbeeck","doi":"10.1016/j.fecs.2024.100279","DOIUrl":"10.1016/j.fecs.2024.100279","url":null,"abstract":"<div><div>Branch angles are an important plant morphological trait affecting light interception within forest canopies. However, studies on branch angles have been limited due to the time-consuming nature of manual measurements using a protractor. Terrestrial laser scanning (TLS), however, provides new opportunities to measure branch angles more efficiently. Despite this potential, studies validating branch angle measurements from TLS have been limited. Here, our aim is to evaluate both manual and automatic branch angle measurements of European beech from TLS data using traditional field-measurements with a protractor as a reference. We evaluated the accuracy of branch angle measurements based on four automated algorithms (aRchiQSM, TreeQSM, Laplacian, Semantic-Laplacian) from TLS data. Additionally, we assessed different ways of manual branch angle measurements in the field. Our study was based on a dataset comprising 124 branch angles measured from six European beech in a European deciduous forest. Our results show that manual branch angle measurements from TLS data are in high agreement with the reference (root-mean-squared error, RMSE: [3.57°–4.18°], concordance correlation coefficient, CCC: [0.95−0.97]) across different branch length positions. Automated algorithms also are in high agreement with the reference although RMSE is approximately twice as large compared to manual branch angle measurements from TLS (RMSE: [9.29°–10.55°], CCC: [0.83−0.86]) with manual leaf points removal. When applying the automatic wood-leaf separation algorithm, the performance of the four methods declined significantly, with only approximately 20 branch angles successfully identified. Moreover, it is important to note that there is no influence of the measurement position (branch surface versus center) for branch angle measurements. However, for curved branches, the selection of branch measurement length significantly impacts the branch angle measurement. This study provides a comprehensive understanding of branch angle measurements in forests. We show that automated measurement methods based on TLS data of branch angles are a valuable tool to quantify branch angles at larger scales.</div></div>","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"12 ","pages":"Article 100279"},"PeriodicalIF":3.8,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the heartwood contribution to carbon accumulation in Pinus sylvestris L. trees under different forest site conditions","authors":"Natalia A. Galibina,&nbsp;Kseniya M. Nikerova,&nbsp;Sergey A. Moshnikov,&nbsp;Alexander M. Kryshen","doi":"10.1016/j.fecs.2024.100274","DOIUrl":"10.1016/j.fecs.2024.100274","url":null,"abstract":"<div><h3>Background</h3><div>The heartwood (HW) proportion in the trunk of mature trees is an important characteristic not only for wood quality but also for assessing the role of forests in carbon sequestration. We have for the first time studied the proportion of HW in the trunk and the distribution of carbon and extractives in sapwood (SW) and HW of 70–80 year old <em>Pinus sylvestris</em> L. trees under different growing conditions in the pine forests of North-West Russia.</div></div><div><h3>Method</h3><div>We have examined the influence of conditions and tree position in stand (dominant, intermediate and suppressed trees) in the ecological series: blueberry pine forest (Blu) – lingonberry pine forest (Lin) – lichen pine forest (Lic). We have analyzed the influence of climate conditions in the biogeographical series of Lin: the middle taiga subzone – the northern taiga subzone – the transition area of the northern taiga subzone and tundra.</div></div><div><h3>Results</h3><div>We found that the carbon concentration in HW was 1.6%–3.4% higher than in SW, and the difference depended on growing conditions. Carbon concentration in HW increased with a decrease in stand productivity (Blu-Lin-Lic). In medium-productive stands, the carbon concentration in SW was higher in intermediate and supressed trees compared to dominant trees. In the series from south to north, carbon concentration in HW increased by up to 2%, while in SW, it rose by 2.7%–3.8%.</div></div><div><h3>Conclusions</h3><div>Our results once again emphasized the need for an empirical assessment of the accurate carbon content in aboveground wood biomass, including various forest growing conditions, to better understand the role of boreal forests in carbon storage.</div></div>","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"12 ","pages":"Article 100274"},"PeriodicalIF":3.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drivers and patterns of community completeness suggest that Tuscan Fagus sylvatica forests can naturally have a low plant diversity","authors":"Emanuele Fanfarillo ,&nbsp;Leopoldo de Simone ,&nbsp;Tiberio Fiaschi ,&nbsp;Bruno Foggi ,&nbsp;Antonio Gabellini ,&nbsp;Matilde Gennai ,&nbsp;Simona Maccherini ,&nbsp;Emilia Pafumi ,&nbsp;Enrico Tordoni ,&nbsp;Daniele Viciani ,&nbsp;Giulio Zangari ,&nbsp;Claudia Angiolini","doi":"10.1016/j.fecs.2024.100276","DOIUrl":"10.1016/j.fecs.2024.100276","url":null,"abstract":"<div><div>European beech (<em>Fagus sylvatica</em> L.) forests can have a high variability in plant species richness and abundance, from monospecific stands to highly species-rich communities. To understand what causes the low plant diversity observed in some beech forests, we analyzed the drivers of plant community completeness in 155 vegetation plots. Data were collected in mature, closed-canopy beech forests in Tuscany, central Italy. Site-specific species pools were estimated based on species co-occurrences. We used Generalized Least Squares linear modeling to assess the effects of anthropogenic and environmental drivers on the community completeness of whole communities and on the set of specialist species of beech forests. We also tested the response of the total cover of the herb layer to the selected predictors and related both the predictive and response variables to species composition in a Non-metric Multidimensional Scaling ordination. The community completeness of whole communities and that of beech forest specialists were negatively affected by total beech cover and positively influenced by slope. Moreover, the community completeness of whole communities was negatively impacted by elevation and positively influenced by disturbance frequency. The cover of the herb layer decreased with increasing beech cover, elevation, and precipitation. High community completeness and high cover of the herb layer were associated with the presence of thermophilic species of mixed deciduous woods in low-elevation beech forests. Our results suggest that a low plant community completeness and a low cover of the herb layer are mainly due to the competition by beech itself when it forms pure forests in its ecological optimum. Such competition is better exerted at upper elevations and in sites with low slopes, where beech litter accumulation is a limiting factor for understory species. Such evidence suggests that species absence in mature beech forests is mainly due to natural drivers and should therefore not be considered an indicator of ecological degradation of the forest.</div></div>","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"12 ","pages":"Article 100276"},"PeriodicalIF":3.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sensitivity of gross primary production and evapotranspiration to heat and drought stress in a young temperate plantation in northern China","authors":"Hongxian Zhao ,&nbsp;Zeyuan Zhou ,&nbsp;Feng Zhang ,&nbsp;Charles P.-A. Bourque ,&nbsp;Xin Jia ,&nbsp;Xinhao Li ,&nbsp;Peng Liu ,&nbsp;Haiqun Yu ,&nbsp;Yun Tian ,&nbsp;Chuan Jin ,&nbsp;Shaorong Hao ,&nbsp;Tianshan Zha","doi":"10.1016/j.fecs.2024.100275","DOIUrl":"10.1016/j.fecs.2024.100275","url":null,"abstract":"<div><div>Assessing the sensitivities of ecosystem functions to climatic factors is essential to understanding the response of ecosystems to environmental change. Temperate plantation forests contribute to global greening and climate change mitigation, yet little is known as to the sensitivity of gross primary production (GPP) and evapotranspiration (ET) of these forests to heat and drought stress. Based on near-continuous, eddy-covariance and hydrometeorological data from a young temperate plantation forest in Beijing, China (2012–2019), we used a sliding-window-fitting technique to assess the seasonal and interannual variation in ecosystem sensitivity (i.e., calculated slopes, <em>S</em>_GPP-Ta, <em>S</em>_ET-Ta, <em>S</em>_GPP-EF, and <em>S</em>_ET-EF) in GPP and ET to anomalies in air temperature (<em>T</em>_a) and evaporative fraction (EF). The EF was used here as an indicator of drought. Seasonally, daily <em>S</em>_GPP-Ta, <em>S</em>_ET-Ta, and <em>S</em>_GPP-EF were greatest in summer, reaching maxima of 1.12 ​± ​0.56 ​g ​C·m⁻²·d⁻¹⋅°C⁻¹, 1.36 ​± ​0.56 ​g H₂O·m⁻²·d⁻¹⋅°C⁻¹, and 0.37 ​± ​0.35 ​g ​C·m⁻²·d⁻¹, respectively. Evapotranspiration was constrained by drought, especially during the spring-to-summer period, <em>S</em>_ET-EF reaching −0.51 ​± ​0.34 ​g H₂O·m⁻²·d⁻¹. Variables EF, <em>T</em>_a, soil water content (SWC), vapor pressure deficit (VPD), and precipitation (PPT) were the main controls of sensitivity, with <em>S</em>_GPP-Ta and <em>S</em>_ET-Ta increasing with <em>T</em>_a, VPD, and PPT (&lt;50 ​mm·d⁻¹) during both spring and autumn. Increased drought stress during summer caused the positive response in GPP and ET to decrease with atmospheric warming. Variable <em>S</em>_ET-EF intensified (i.e., became more negative) with decreasing EF and increasing <em>T</em>_a. Interannually, annual <em>S</em>_GPP-Ta and <em>S</em>_ET-Ta were positive, <em>S</em>_GPP-EF near-neutral, and <em>S</em>_ET-EF negative. Interannual variability in <em>S</em>_GPP-Ta, <em>S</em>_ET-Ta, <em>S</em>_ET-EF, and <em>S</em>_GPP-EF was largely due to variations in bulk surface conductance. Our study suggests that the dynamics associated with the sensitivity of ecosystems to changes in climatic factors need to be considered in the management of plantation forests under future global climate change.</div></div>","PeriodicalId":54270,"journal":{"name":"Forest Ecosystems","volume":"12 ","pages":"Article 100275"},"PeriodicalIF":3.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}